It think it's a Nested List.
Im so sorry if this is wrong
4, 5 , 6 , and plus key
456+
Answer is A. Red and Blue
This because these are the same color of emergency lights that are used on Emergency vehicles like ambulances, police cars, fire trucks, etc. We wouldn't want normal citizens confusing drivers with police officers in case of an actual emergency.
Answer:
I think it would be A, good luck!
